High severity8.0NVD Advisory· Published Aug 5, 2026· Updated Aug 26, 2026
CVE-2026-71279
CVE-2026-71279
Description
Zigbee2MQTT's ExternalJSExtension.getFilePath (lib/extension/externalJS.ts) joins a parameter received via an MQTT message (topic zigbee2mqtt/bridge/request/extension/save) into the extensions base path using path.join(basePath, name) with no sanitization. The extension handler only validates that the name ends in .js/.mjs/.cjs, writes the file, and then dynamically imports it via Node.js import, achieving remote code execution.
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Affected products
1Patches
Vulnerability mechanics
References
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